CodeMirror.defineMode("python", function (conf, parserConf) {
  var ERRORCLASS = 'error';

  function wordRegexp(words) {
    return new RegExp("^((" + words.join(")|(") + "))\\b");
  }

  var singleOperators = new RegExp("^[\\+\\-\\*/%&|\\^~<>!]");
  var singleDelimiters = new RegExp('^[\\(\\)\\[\\]\\{\\}@,:`=;\\.]');
  var doubleOperators = new RegExp("^((==)|(!=)|(<=)|(>=)|(<>)|(<<)|(>>)|(//)|(\\*\\*))");
  var doubleDelimiters = new RegExp("^((\\+=)|(\\-=)|(\\*=)|(%=)|(/=)|(&=)|(\\|=)|(\\^=))");
  var tripleDelimiters = new RegExp("^((//=)|(>>=)|(<<=)|(\\*\\*=))");
  var identifiers = new RegExp("^[_A-Za-z][_A-Za-z0-9]*");

  var wordOperators = wordRegexp(['and', 'or', 'not', 'is', 'in']);
  var commonkeywords = ['as', 'assert', 'break', 'class', 'continue',
    'def', 'del', 'elif', 'else', 'except', 'finally',
    'for', 'from', 'global', 'if', 'import',
    'lambda', 'pass', 'raise', 'return',
    'try', 'while', 'with', 'yield'];
  var commontypes = ['bool', 'classmethod', 'complex', 'dict', 'enumerate',
    'float', 'frozenset', 'int', 'list', 'object',
    'property', 'reversed', 'set', 'slice', 'staticmethod',
    'str', 'super', 'tuple', 'type'];
  var py2 = {'types':['basestring', 'buffer', 'file', 'long', 'unicode',
    'xrange'],
    'keywords':['exec', 'print']};
  var py3 = {'types':['bytearray', 'bytes', 'filter', 'map', 'memoryview',
    'open', 'range', 'zip'],
    'keywords':['nonlocal']};

  if (!!parserConf.version && parseInt(parserConf.version, 10) === 3) {
    commonkeywords = commonkeywords.concat(py3.keywords);
    commontypes = commontypes.concat(py3.types);
    var stringPrefixes = new RegExp("^(([rb]|(br))?('{3}|\"{3}|['\"]))", "i");
  } else {
    commonkeywords = commonkeywords.concat(py2.keywords);
    commontypes = commontypes.concat(py2.types);
    var stringPrefixes = new RegExp("^(([rub]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
  }
  var keywords = wordRegexp(commonkeywords);
  var types = wordRegexp(commontypes);

  var indentInfo = null;

  // tokenizers
  function tokenBase(stream, state) {
    // Handle scope changes
    if (stream.sol()) {
      var scopeOffset = state.scopes[0].offset;
      if (stream.eatSpace()) {
        var lineOffset = stream.indentation();
        if (lineOffset > scopeOffset) {
          indentInfo = 'indent';
        } else if (lineOffset < scopeOffset) {
          indentInfo = 'dedent';
        }
        return null;
      } else {
        if (scopeOffset > 0) {
          dedent(stream, state);
        }
      }
    }
    if (stream.eatSpace()) {
      return null;
    }

    var ch = stream.peek();

    // Handle Comments
    if (ch === '#') {
      stream.skipToEnd();
      return 'comment';
    }

    // Handle Number Literals
    if (stream.match(/^[0-9\.]/, false)) {
      var floatLiteral = false;
      // Floats
      if (stream.match(/^\d*\.\d+(e[\+\-]?\d+)?/i)) {
        floatLiteral = true;
      }
      if (stream.match(/^\d+\.\d*/)) {
        floatLiteral = true;
      }
      if (stream.match(/^\.\d+/)) {
        floatLiteral = true;
      }
      if (floatLiteral) {
        // Float literals may be "imaginary"
        stream.eat(/J/i);
        return 'number';
      }
      // Integers
      var intLiteral = false;
      // Hex
      if (stream.match(/^0x[0-9a-f]+/i)) {
        intLiteral = true;
      }
      // Binary
      if (stream.match(/^0b[01]+/i)) {
        intLiteral = true;
      }
      // Octal
      if (stream.match(/^0o[0-7]+/i)) {
        intLiteral = true;
      }
      // Decimal
      if (stream.match(/^[1-9]\d*(e[\+\-]?\d+)?/)) {
        // Decimal literals may be "imaginary"
        stream.eat(/J/i);
        // TODO - Can you have imaginary longs?
        intLiteral = true;
      }
      // Zero by itself with no other piece of number.
      if (stream.match(/^0(?![\dx])/i)) {
        intLiteral = true;
      }
      if (intLiteral) {
        // Integer literals may be "long"
        stream.eat(/L/i);
        return 'number';
      }
    }

    // Handle Strings
    if (stream.match(stringPrefixes)) {
      state.tokenize = tokenStringFactory(stream.current());
      return state.tokenize(stream, state);
    }

    // Handle operators and Delimiters
    if (stream.match(tripleDelimiters) || stream.match(doubleDelimiters)) {
      return null;
    }
    if (stream.match(doubleOperators)
      || stream.match(singleOperators)
      || stream.match(wordOperators)) {
      return 'operator';
    }
    if (stream.match(singleDelimiters)) {
      return null;
    }

    if (stream.match(types)) {
      return 'builtin';
    }

    if (stream.match(keywords)) {
      return 'keyword';
    }

    if (stream.match(identifiers)) {
      return 'variable';
    }

    // Handle non-detected items
    stream.next();
    return ERRORCLASS;
  }

  function tokenStringFactory(delimiter) {
    while ('rub'.indexOf(delimiter.charAt(0).toLowerCase()) >= 0) {
      delimiter = delimiter.substr(1);
    }
    var singleline = delimiter.length == 1;
    var OUTCLASS = 'string';

    return function tokenString(stream, state) {
      while (!stream.eol()) {
        stream.eatWhile(/[^'"\\]/);
        if (stream.eat('\\')) {
          stream.next();
          if (singleline && stream.eol()) {
            return OUTCLASS;
          }
        } else if (stream.match(delimiter)) {
          state.tokenize = tokenBase;
          return OUTCLASS;
        } else {
          stream.eat(/['"]/);
        }
      }
      if (singleline) {
        if (parserConf.singleLineStringErrors) {
          return ERRORCLASS;
        } else {
          state.tokenize = tokenBase;
        }
      }
      return OUTCLASS;
    };
  }

  function indent(stream, state, type) {
    type = type || 'py';
    var indentUnit = 0;
    if (type === 'py') {
      for (var i = 0; i < state.scopes.length; ++i) {
        if (state.scopes[i].type === 'py') {
          indentUnit = state.scopes[i].offset + conf.indentUnit;
          break;
        }
      }
    } else {
      indentUnit = stream.column() + stream.current().length;
    }
    state.scopes.unshift({
      offset:indentUnit,
      type:type
    });
  }

  function dedent(stream, state) {
    if (state.scopes.length == 1) return;
    if (state.scopes[0].type === 'py') {
      var _indent = stream.indentation();
      var _indent_index = -1;
      for (var i = 0; i < state.scopes.length; ++i) {
        if (_indent === state.scopes[i].offset) {
          _indent_index = i;
          break;
        }
      }
      if (_indent_index === -1) {
        return true;
      }
      while (state.scopes[0].offset !== _indent) {
        state.scopes.shift();
      }
      return false
    } else {
      state.scopes.shift();
      return false;
    }
  }

  function tokenLexer(stream, state) {
    indentInfo = null;
    var style = state.tokenize(stream, state);
    var current = stream.current();

    // Handle '.' connected identifiers
    if (current === '.') {
      style = state.tokenize(stream, state);
      current = stream.current();
      if (style === 'variable') {
        return 'variable';
      } else {
        return ERRORCLASS;
      }
    }

    // Handle decorators
    if (current === '@') {
      style = state.tokenize(stream, state);
      current = stream.current();
      if (style === 'variable'
        || current === '@staticmethod'
        || current === '@classmethod') {
        return 'meta';
      } else {
        return ERRORCLASS;
      }
    }

    // Handle scope changes.
    if (current === 'pass' || current === 'return') {
      state.dedent += 1;
    }
    if ((current === ':' && !state.lambda && state.scopes[0].type == 'py')
      || indentInfo === 'indent') {
      indent(stream, state);
    }
    var delimiter_index = '[({'.indexOf(current);
    if (delimiter_index !== -1) {
      indent(stream, state, '])}'.slice(delimiter_index, delimiter_index + 1));
    }
    if (indentInfo === 'dedent') {
      if (dedent(stream, state)) {
        return ERRORCLASS;
      }
    }
    delimiter_index = '])}'.indexOf(current);
    if (delimiter_index !== -1) {
      if (dedent(stream, state)) {
        return ERRORCLASS;
      }
    }
    if (state.dedent > 0 && stream.eol() && state.scopes[0].type == 'py') {
      if (state.scopes.length > 1) state.scopes.shift();
      state.dedent -= 1;
    }

    return style;
  }

  var external = {
    startState:function (basecolumn) {
      return {
        tokenize:tokenBase,
        scopes:[
          {offset:basecolumn || 0, type:'py'}
        ],
        lastToken:null,
        lambda:false,
        dedent:0
      };
    },

    token:function (stream, state) {
      var style = tokenLexer(stream, state);

      state.lastToken = {style:style, content:stream.current()};

      if (stream.eol() && stream.lambda) {
        state.lambda = false;
      }

      return style;
    },

    indent:function (state, textAfter) {
      if (state.tokenize != tokenBase) {
        return 0;
      }

      return state.scopes[0].offset;
    }

  };
  return external;
});

CodeMirror.defineMIME("text/x-python", "python");
